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    <p>If you mean dynamically create a class, then the two options are:</p> <ul> <li><a href="http://msdn.microsoft.com/en-us/library/3y322t50.aspx" rel="nofollow noreferrer">Reflection.Emit</a> - Difficult, Fast to create the class</li> <li><a href="http://msdn.microsoft.com/en-us/library/y2k85ax6.aspx" rel="nofollow noreferrer">CodeDom</a> - Less Difficult, Slower to create the class</li> </ul> <p>If you mean create an instance of an existing class, then start with <a href="http://msdn.microsoft.com/en-us/library/system.activator.createinstance.aspx" rel="nofollow noreferrer">Activator.CreateInstance</a> to create an instance of the object, and then look at the methods on <a href="http://msdn.microsoft.com/en-us/library/system.type.aspx" rel="nofollow noreferrer">Type</a> such as <a href="http://msdn.microsoft.com/en-us/library/system.type.getproperty.aspx" rel="nofollow noreferrer">GetProperty</a> which will return a <a href="http://msdn.microsoft.com/en-us/library/system.type.getproperty.aspx" rel="nofollow noreferrer">PropertyInfo</a> that you can call <a href="http://msdn.microsoft.com/en-us/library/system.reflection.propertyinfo.getvalue.aspx" rel="nofollow noreferrer">GetValue</a> and <a href="http://msdn.microsoft.com/en-us/library/system.reflection.propertyinfo.setvalue.aspx" rel="nofollow noreferrer">SetValue</a> on.</p> <hr> <p>Update: For the scenario you describe, returning dynamic data from a web service, then I'd recommend against this approach as it's hard for you to code, and hard for statically-typed languages to consume. Instead, as suggested in the comments and one of the other answers, some sort of dictionary would likely be a better option.</p> <p>(Note that when I say return some sort of dictionary, I am speaking figuratively rather than literally, i.e. return something which is conceptually the same as a dictionary such as a list of key-value pairs. I wouldn't recommend directly returning one (even if you're using WCF which does support this) because it's typically better to have full control over the XML you return.)</p>
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    1. PO.NET Reflection Create Class Properties
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    1. USGreg Beech
    1. USGreg Beech
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    1. COThe performance difference is an upfront cost, once all is said and done the code generated by Emit or CodeDom should be simillar in performance.
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      1. USJoshBerke
    2. CO@Josh - Good point, updated the answer to reflect this.
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    3. COyou aren't allowed to return a dictionary in the web service
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      1. USRuss Bradberry
 

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